A Colorimeter for the Determination of Epinephrine by the Method of Suto and Inouye

Kojima, Takeo

doi:10.1620/tjem.10.281

Cited by 1 publication

(3 citation statements)

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“…The value of Kojima et a1. 6 ) is approximately 4 kJ more positive at I 873 K than that obtained in this study. The results of Karasev et al ') are considerably more positive ( -32 kJ) and those of Narita et a1.…”

Section: Resultscontrasting

confidence: 58%

“…The present results are in good agreement with those of Chipman and Dastur") and Narita") at 1873 K, while the data of Kojima et a1. 6 ) is more negative by 2.5 kJ. The data of Karasev et al7) are considerably more positive and this is perhaps due to the incorrect criterion for the attainment of equilibrium -appearance of an oxide film -used in their study.…”

Section: Resultsmentioning

confidence: 75%

“…Approximately 50 g of high purity iron was contained in a thoria crucible, lined with V 20 3 or Nb0 2. Approximately 6 g of other oxides such as FeV 204 , VOl +x or FeNb 20 6 were added to the crucible as required. The crucible was supported in the even temperature zone of a molybdenum furnace on a thermocouple protection sheath inside an alumina working tube.…”

Section: Experimental Techniquementioning

confidence: 99%

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Alloy/oxide equilibria in Fe—V—O and Fe—Nb—O systems

Kumar¹,

Jacob²

1987

Steel Research

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An experimental characterization of three‐phase equilibria in Fe—V—O and Fe—Nb—O systems at 1 823, 1 873, and 1 923 K has been carried out using a solid state cell and by analysis of quenched samples. The oxygen potentials corresponding to these three‐phase equilibria were monitored by a solid state cell incorporating Y2O3 doped ThO2 with Cr + Cr2O3 as reference electrode. Similar measurements were carried out for Fe—Nb—O alloys in equilibrium with a mixture of FeNb2O6 and NbO2. These measurements permit evaluation of interaction parameters (evo= ‐6590/T+2.892 and eNbo = ‐4066/T+1.502) and activity coefficients of vanadium and niobium in dilute solution (In yov = ‐35320/T+12.68 and In yoNb = ‐ 12386/T+ 4.34) in liquid iron. The results obtained in this study resolve a number of discrepancies in thermodynamic data reported in the literature, especially regarding the activity coefficients of V and Nb and the stability ranges for V2O3 and VO1+x.